Ring trip circuit
阅读：920发布：2021-09-07
专利汇可以提供Ring trip circuit专利检索，专利查询，专利分析的服务。并且A ring trip arrangement for a ringing circuit including a ring trip relay having dual winding coils, rectifying means and capacitive means arranged in two series-shunt circuit combinations. Each of these circuit combinations exhibit under alternating current flow conditions substantially equal and offsetting electrical parameters including subtracting electromagnetic flux fields to maintain an inoperative energization state for the relay. Under direct current flow conditions, balanced flux fields of the relay coils are upset and the ring trip relay is operated.，下面是Ring trip circuit专利的具体信息内容。
1. In a communication switching system having a station connectible ringing circuit traversed during ringing intervals by alternating current only and traversed when the ring is answered by direct current as well, a ring trip arrangement comprising a relay having two windings, a pair of rectifying means connected in series with said two windings, respectively, for conducting unidirectional currents therethrough during opposite half cycles of said alternating current, a pair of capacitive means connected in parallel with said two windings and in series with said pair of rectifying means, respectively, for providing charge storage action during conduction of said associated rectifying means and further providing unidirectional current flowing through said associated winding when the other rectifying means is conducting unidirectional current through its associated winding, said unidirectional currents through said two windings during each half cycle of alternating current flowing in opposite directions for maintaining substantially off-setting electromagnetic flux fields between said two windings whereby said relay is maintained in an inoperative state, and when said ringing circuit is traversed by direct current as well, only one of said rectifying means is conductive of said direct current for causing said offsetting flux fields to become unbalanced whereby said relay device is operated and the ring is tripped.
2. A ring trip arrangement as claimed in claim 1 wherein associated ones of said capacitive means, rectifying means and said windings comprise two series-shunt circuit combinations, said two series-shunt combinations being connected in electrical parallel and have substantially equal electrical parameters.
3. A ring trip arrangement as claimed in claim 1 wherein said two windings of said relay have a relatively small magnitude of mutual coupling of flux fields to prevent the flux field of one of said windings from bucking the flux field of the other of said windings.
4. A ring trip arrangement as claimed in claim 1 wherein said relay is a first relay, said first relay includes at least a set of contacts having an armature connected to said two windings of said first relay for moving from a first contact position to a second contact position when said first relay is operated, said alternating current is supplied from ringing source means, said ringing source means being conneCted to said first contact position for providing the disconnection thereof with operation of said first relay, a second relay is provided having a winding connected to said second contact position for operating of said second relay with movement of said armature to said second contact position, the operation of said second relay providing the disconnection of said ringing circuit from said station and further introducing through its operate time a time delay between the operation of said first relay and the operation of said second relay.
5. A ring trip arrangement as claimed in claim 2 wherein said capacitive means and said parallel connected windings which comprise said shunt circuit combinations provide a time constant of a duration in the order of three times the duration of each half cycle of said alternating current.
6. A ring trip arrangement of ringing circuit traversed by both alternating current and direct current and including a ring trip relay having an inoperative state when traversed by said alternating current and being operable to a tripped state when traversed by said direct current, the improvement comprising a pair of energizable relay windings for said ring trip relay, a pair of oppositely poled rectifying means connected in electrical series with said two windings, respectively, a pair of capacitive means connected in electrical series with said rectifying means, respectively, and in electrical parallel with said two windings, respectively, said capacitive means being alternately charged by said alternating current to sustantially equal and opposite charges for alternately impressing by means of unidirectional pulsating discharge currents substantially equal and opposite flux fields on said two windings, respectively, to provide said inoperative state by means of balanced flux fields, said balanced flux fields being removed when said direct current is established in said ringing circuit.
7. In a communication switching system having a ringing circuit traversed during ringing intervals by alternating current only and traversed when the ring is answered, by direct current as well, a ring trip arrangement comprising a ring trip relay having two windings, a pair of oppositely poled rectifying means and a pair of capacitive means, each of said two windings having a respective one of said capacitive means connected in shunt thereto to form a shunt combination, each of said two rectifying means being connected in series with a respective one of said two shunt combinations to form a series-shunt combination, said two series-shunt combinations being included in said ringing circuit in parallel relationship to each other, and said two shunt combinations having substantially equal electrical parameters and their time constants being such that, prior to answering, the pulsating unidirectional currents flowing in opposite directions through said two windings are, due to the storage action of said capacitive means, sufficiently balanced during each half cycle of said alternating current to keep said relay from operating whereas upon answering said balance is upset to cause said relay to operate and trip the ring.
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